Rotary pump



Aug. 18, 1942- w. L. DAVIS ROTARY PUMP Fi led Nov. 3, 1959 3 Sheets-Sheet l v 5 J 3 m a 8 v %4 N W% MW 1942- w. L. DAVIS 2,293,119

ROTARY PUMP Filed Ndv. s, 1959 5 Sheets-Sheet 2 Ell" . INVIINTOR. M94 w/n' L. Dar/q BY eff/ f ATTo NEYs w. L. DAVIS ROTARY PUMP Aug. 18, 1942.

3 Sheets-Sheet 5 Filed Nov. 5, 1939 INVENTOR. W/uw/r/ LgOnwJ 7/ TZRNEYS said one vane are so formed that the latter can,

Patented Aug. .18., 1942 UNITED STATES PATENT': OFFICE M 32 3 1 Walwin L. Davis, Avon, Ohio ApplicationNoveiirber a, 1939, Serial No. 302,736 7 4 Claims. (01. 103-138) This invention has to do with rotary pumps of the type having a piston carrying vanes arranged in intersecting diametrically extending planes and, as its principal object, aims to pro-- vide an improved and simplified construction for pumps of this type in which fewer parts are re- 1 I quired than heretofore by reason of the use" of vanes of one-piece construction so formed that a they canbe assembled into or removed from the piston by simply inserting them through the piston slots.

Another object of my invention is to provide an improved rotary-pump of the type having a .piston slotted intermediate its ends and carrying a pair of vanes arranged in intersecting diametrically extending planes, in which the'vanes are of one-piece construction with one vane ex-' tending through an opening or recess of the other vane and'cooperating portions of the piston and when taken inconjunction with the accompanying sheets ofdrawings in which;

Fig. 1 is an elevation, with parts broken away, showing a rotary pump constructed according to my invention; M

Fig. 2 is a transverse sectionalview taken through the pump asindicated by line 22 of 1;

Fig. 3 is a perspective view showing one of the vanes of the putnp; f

other vane of the pump;

Fig. 5.is an end view: of the piston with the vane of Fig. 3 iii position therein and showing the Fig. 11 is an end view of the piston with the vane of Fig. 9 assembled therein and showing the vane of Fig. 10 being assembled into or removed from the piston by edgewise movement. through one of the slots thereof;

Fig. 12 is a side elevation of the piston further illustrating the construction thereof and the manner in which the vanes are assembled into through the pumpon line H-ll of Fig. 13;

' from the pump and illustrating the operation of Fig.- 15 is an end view of the piston removed assembling the vanes into the piston;

Fig. 16 is,a side view, more or less diagrammatic in form, further showing how the vanes can be inserted into or removed from the piston; and 1 Fig. 17 isa perspective view showing one of the vanes removed from the piston.

The embodiments of my invention illustrated in the accompanying drawings will now be described in greater detail, but it should be under stood,'that the invention is not limited to the particular constructions and arrangements here shown but may be embodied in various other r0- .tary pumps or similar devices. Certain of the rotary pump improvements herein disclosed .but

' not claimed, are claimed in my copending dig In the embodiment of my invention Fig. 4 is a similar perspective view showing .the H vane of'Fig. 4 being inserted into the piston by edgewise movement through one of the slots thereof;

Fig? 6 is a view, more or less diagrammatic in form. showing how the vanes of my pump can be 5 inserted into or removed from the piston;

Fig. 7 is an elevation, with parts broken away, showing another rotary pump constructed according to my invention;

Fig. 8 is a transverse sectional view through visional application Serial I illustrated in Figs. 1 and 2, 1 show a rotary pump comprising in general a casing or housing i5 provided with fluid inlet and outlet passages l6 and I1,

and 'a piston 18 rotatable in 'the housing and carrying a pair, of vanes l9 and 20 extending diametrically at substantially right angles to each other. j i

v The housing I! maybe formed of connected sections which include an intermediate or cylinder section II having a liner 22 therein and cover "sections 23 and 24 which may be bolted or otherwise connected to the ends of the cylinder section. The liner defines a working chamber or cylinder 25 and'has openings 22a; and 221; therethe pump taken substantially on line 8-8 of through which connect the passages l6 and H with the. cylinder.

The piston I8 may comprise an elongated hollow one-piece body of cylindrical cross-section which may be somewhat longer than the cylinder chamber 25 and the liner 22 so that its ends extend into corresponding recesses 23a and 24a of the end sections or cover members 23 and 24 of the housing and have. a. running clearance therein. The piston may have axially aligned shaftlike projections 26 and 21 on opposite ends thereof which are received in suitable bearings 28 and 29 of the housing sections 23 and 24 for mounting the piston in the housing E5. The bearings 23 and 29 are offset with respect to the axis of the liner 22 so as to support the piston is in eccentric relation therein with the outer surface of the piston tangent to the inner surface of the liner, as shown in Fig. 2. One of the shaft-like extensions of the piston, in this instance the extension 21, may have a flange 30 connected therewith by which the piston of the pump can be connected with a power shaft or other suitable driving means.

As shown in Figs. 1 and 2, the piston i8 has a pair or set cf diametrically opposed radial slots 3i and 32 through which the vane i3 extends and a second pair or set of diametrically opposed radial slots 33 and 33 spacedsubstantially 90 from the first pair of slots and through which the vane extends. These slotsextend axially of the piston but terminate inwardly of the ends thereof and, as shown in Fig. 1, are of substantially the same axial length as the cylinder chamber 25. The vanes 49 and 20, which are freely slidable in the piston slots, are of a length substantially equal to the liner 22 and, at their ends have running clearance with the end walls of the cylinder chamber. With the construction and arrangement thus far described, it will be seen that rotation of the piston -l8 in the housing will drive the vanes and cause fluid to be drawn in through one of the passages, for example the passage l 6 herein designated the inlet passage, and to' be discharged fromthe housing through the other passage l'l thereof.

several pieces which must be held together by' screws or other connecting'means'.

In order to have the vanes l9 and 20 extend diametrically through the piston IS in intersecting relation, I provide the vane IS with an opening or recess 36 lying wholly within its edges and through which the vane 20 extends. To be able to assemble the vanes into or remove the same from the piston I8, I construct the vanes and the piston so that relative axial shifting can take place between-the vanes and so that by imparting edgewise tilting or angular movement to the Vane 20 it can be moved through the slot 33 of the piston and through the opening 36 of the vane l9 and thereby assembled into or removed from the slots33 and 34 of thepiston. To this end I opening of the vane If! by edgewise angular movement through one of the slots of the piston. As will be seen from Figs. 3 and 4 the vane I9 is in the shape' of a quadrangular ring and the vane 23 has a modified H or I shape.

To permit the edgewise angular movement of the vane 20 as well as the above-mentioned relative axial-shifting between the vanes i9 and 20, v

I8, the vane I9 is first inserted so as to extend through the pair of slots 3! and 32. The open end of the vane 20 is then partially inserted into the piston b passing the side 20a edgewise through the slot 33 thereby bringing the vane to the tilted or angular position 290 shown in dotted lines in Fig. 6. When the vane occupies this position it will be noted that the left end of the side 20a extends into or through the slot 38 and that the .corner 31a of the recess 37 lies near the end of the slot 33. Now by swinging or further tilting the vane 20 and using the end of the side 20a as a fulcrum or pivot, the vane can be moved farther into the piston so as to assume the second posi- "tion 20d shown in dotted lines in Fig. 6 and in full lines in Fig. 5 in which the sides 20a and 20b are substantially parallel with the piston axis but the vane is not centered axially or radially of the piston. The next step is to shift the vane cedure is followed, that is to say, the vane '20 is construct the vanev 20 with a generally quad- I rangular clearance recess 31 which opens through the end of the vane betweenthe side portions or elements 20;; and 20b thereof. As will'be more fully understood hereinafter, -this recess or end opening 31 has dimensions axially and trans versely of the vane such as to permit the vane to be inserted into the piston I8 and throughthe 20 axially toward the right as seen in Fig. 6 and thereby withdraw the end of the side 20a from the slot 38, after which the vane is lowered or shifted radially thereby moving the side 20a into or through the slot 34 and bringing the vane to .its assembled position such as the full line position We shown in Fig. 6. While I have described the insertion of the vane 20 as being a step-bystep movement, it will be understood, of course. that in actual practice this insertion of the vane 20 may be a more or less continuous movement.

While I have described the insertion of the vane 20 by calling for movement of the side20a through the slot 33, this can be carried out by inserting the side 20b through the slot 34. To permit this to be done I provide the end wall l8a of the piston with another slot 38 located diametrically opposite the one referred to above. This duplication of the slot 38 also improves the balance of the piston.

In removing the vanes I9 and 20 from the pistop 18, the reverse of the above-described profirst partly withdrawn from the piston by radial movement in the slots 33 and 34 thereof. This vane is then'shifted axially of the piston toward the left, as shown in Fig. 6, thereby bringing the end of the side 20a. of the vane-into the clearance slot or opening 38. The vane is then tilted or I swung edgewise to the dotted-line position 200,

after which it can be freely withdrawn from the they may have grooves therein in which axially desirable to provide an opening 4| therein and a recess 42 in its opposite end. It will be understood, of course, that the shape of the vanes l9 and 26 and of the openings or recesses therein can be varied considerably but that the axial length of the openings 36 and 31 should be sufficient to permit' the above-explained edgewise movement of the vane 29 to or from its assembled position in the piston.

In Figs. 7 and 8 I show another rotary pump constructed according to my invention andembodying the above-explained objects and features. This rotary pump comprises an outer casing or housing 45 having a cylinder liner 46 therein, and a piston 41 rotatable in the liner and carrying a' pair of vanes 48 and 49 which extend in the outer housing 45, and in which the axially aligned projections or shaft portions .52 and 53 of the piston are journaled. The housing sections or hearing members 50 and also form end walls for the cylinder chamber or working space 54 of the pump. I v

The housing 45 is provided with inlet and discharge passages- 55 and 56 which communicate with the working chamber 54 through openings- 51 provided in the liner 46 and from the arrangement above described it will be seen that rotation of the piston 41 by power applied to the shaft extension 53 thereof, will cause fluid to be drawn in through the inlet passage and delivered through the discharge passage.

The piston may comprise a one-piece hollow member having a body portion of substantially.

the same length as the cylinder liner 46 and provided'with pairs or setsof diametrically opposed radial slots in which the vanes 48 and .49 are mounted, the slots 59 and 59 accommodating the vane 46 and the slots- 66 and 6| accommodating the vane'49. The vanes areof a width to project from the piston for cooperation with the wall of the working chamber 54 and are of substantially th same length. as the piston body so as to operate with running clearance between the housing sections or bearing members 50 and 5|.

To eliminate the need for an added number of parts in making upthe vanes and to obtain more eilicient working cooperation between the .vanes and the cylinder liner,I construct the vanes 48 and 49 with a one-piece body as in the case of the vanes l9 and 29 described above. To

, provide for easy. assembly and'removal of the vanes from the piston and also to permit one vane to extend through the other,-I construct the vane 48 with an openingor'recess 63'-lyingwholly within the edges thereof and I construct the vane 49 of H or I shape, that is to say with end recesses or openings 64 therein, so that it may. extend through the vane 48 and can be inserted into or removed from' the piston by edgewise movement in the slots 66 and 6| thereof.

to the' dotted-line position 49a shown in Fig. 12,

-. thereby brought to its full-line assembled position 490. The vane 48 is then shifted axially toward the left so as to center the same with.

respect to the body of the piston 1 To permit the vane 48 to be shifted axially oi the piston and to permit the vane 49 to be in-,

serted and tilted in the manner above explained,

Imay provide th piston 41 with certain clear-' ance openings or slots whichmaybe formed as extensions of I the slots in which the vanes operate. Thus, clearance openings in the form of opposed radial slots 65 may be provided in the shaft projections 52 and 53 of the piston in alignment with, or as extensions of, the slots 58 and 59. Similarly, opposed radial clearance slots or openings 66 are formed in the shaft projections 52 and 53 of the piston substantially in alignment with, or as extensions of, the slots 60 and 6| in which the vane 49 is mounted.

,The slots extensions or clearance openings 65 permit the above-mentioned axial shifting of the vane 48 in the piston and the clearance openings or slot extensions 66 permit the 'H-shaped vane 49 to assume the tilted partially inserted dotted-line position 49a shown in Fig. 12 in which the left end o'f the side portion 49b of the vane extends intoone .of the clearance openings 66 and fulcrums therein as the vane is swung or tilted downwardly toward its position 490. The relative axial displacement thus provided for the .vanes 48 and 49 during assembly or removal The vanes 48 and 49 may have their side edges' indirectrunning contact with the inner wall of the cylinder line 45; or as shown in this instance, may be grooved to receive the axially extending bearing and packing elements 61.

The advantages of my invention can be realized to some extent in another manner, that is by increasing the width of the end openings 31 and 64 of the vanes 29 and 49 of the above-described rotary pumps so that the side elements of the vanes can straddle the shaft projection of the piston as thevane is inserted into or removed from the piston by edgewise tilting movement through one of the slots thereof. In a modified construction, such as that just mentioned, it would not be necessary for the radial slots 38 of the piston Hi to extend into the shaft projection "26 and the clearance openings or slot extensions 66 of the piston shown in Fig. 12 could then be omitted.

In Figs. 13-and 14, I show another rotary pump. in which the body of the piston and the inter-- sectin'g through vanes thereof arev each of In assembling the vanes 48 and 4 9 in the piston one-piece construction-and are so formed that the vanes can be assembled into or removed from the piston b'y edgewise movement through the slots thereof. With thPexception of the shape of the vanes, the pump illustrated in Figs. 13 and 14 is generally similar to that of Figs. 1 and 2 and, therefore, only a brief description of the general arrangement. is deemed necessary.

- As shown in the drawings, the pump of Figs.

13 and 14 is provided with a housing 16 having a.

cylindrical'liner 1| therein and a piston 12 which is mounted eccentrically for rotation in-the liner The piston i2 is of one-piece construction and comprises a hollow or recessed cylindrical body having substantially axially aligned shaft projections l9 and fill at its ends by which it is mounted in suitable bearings provided in the housing 10. The radialslots in which the vanes 73 and M are mounted extend axially of the piston but terminate inwardly of the ends there of as indicated in Fig. 13, the axial length of these slots being substantially equal to the axial length of the cylinder chamber 85 defined by the liner 1:. Y

-The vanes 13 and "Hi each have a one-piece body of an axial length substantially equal to that of the radial slots of the piston in which they are operably mounted and have a width such that their opposite side edges are maintained in running contact with the inner face of the liner during rotation of the piston. The

edges of the vanes may be shaped for direct contact with the liner or may have grooves therein in which the contact elements. 82 are mounted.

To permit these one-piece vanes 13 and it to be assembled into or removed from the piston i2 through the slots thereof, and to permit them to operate in the piston in the intersecting relation above mentioned, I form the vanes with a recess or opening 83 therein which extends for a substantial distance axially of the vane and opens through an end thereof between the side or edge portions 83a. and 83b. The vanes 13 and 74 may be identical in size and shape and from the illustration in Fig. 17, it will be seen that they are of recessed quadrangular form and may be conveniently referred to as being substantially C-shaped.

In assembling the vanes into the piston 12, one

of the vanes, for example the vane 13,'is first inserted through one of the pair of slots provided first and following up the operation by the insertion of the other vane. This is made possible by the fact that the vanes '13 and Mare of sub stantially identical shape and construction and are interchangeable.

To enable the above-described operation of assembling the vanes into or removing the same from the piston 72 to be readily carried out, I construct the hollow body of the piston so that the internal chamber or recess 85 thereof ex tends axially a short distance beyond or outwardly of the ends of the slots in which the vanes are mounted. In other words, the ends of bringing the'vane 14" to-the tilted or inclined dotted-line position 14a, shown in Fig. 16. By a combined edgewise swinging or further tilting movement, the vane 14 can then be moved from the position 14a to the dotted-line position 146 recess of the other vane.

the internal chamber orvrecess 85 are extended, by coring into the end walls of the piston or other suitable manner of construction, as indicated at 85a and 85b and these extensions accommodate and provide clearance for the corners 83c and 83d of the vane i l during the edgewise angular swinging and tilting movement thereof. The end extensions 85a and 85b of the chamber or recess of the piston may be formed of the same size or diameter as the main intermediate portion of the chamber, although they can be in-the form of radially extending slots or openings which are cored or otherwise formed in the end walls of the piston substantially in alignment with the slots in which the vanes are mounted, as in the case of the slots 38 shown in Fig. 1.

I desire it to be understood that throughout the specificationand claims where reference is made to the vanes as being of one-piece construction or as having a "single-piece body, these or similar expressions are intended to mean a vane having a unitary body formed from a single-piece of material as distinguished from vanes having a body formed of separate parts which are assembled or connected with each other. It should also be understood that the above. quoted or similar expressions are intended to include all vanes of the type shown in the accompanying drawings regardless of whether or not they are provided at their tips with separate bearing and packing elements, such as the elements 40, 61 and 82.

' From the foregoing description and the accompanying drawings, it will now. be readily seen that'I have provided an improved construction for rotary pumps of the type having a pair of diametrically extending vanes, in which the vanes are of single-piece construction and are so formed that one vane can be assembledinto or removed from the piston by edgewise movement through a slot of the piston and an opening or It will also be seen that by providing clearance slots or recessesin the piston a relative axial shifting of the vanes can take place so that edgewise swinging or angular movement of one vane causes the same to pass through the opening of the other vane.

While I have illustrated and described my improved-construction for rotary pumps in a more or less detailed manner, it will be understood, of

course, that the invention is not limited to the a combinedtilting and swinging movement during which it assumes or passes through the,

dotted-line position lla' preliminary tothe passage of the side portion 83a through the recess 83' of the vane 13 and the complete withdrawal.

particular rotary pumps and details of construction herein disclosed, but may be embodied in various other similar devices and specific con- ,structions coming within the scope of the appended claims.

extending diametrically opposed slots, the slots of each pair being in communication with each other through the interior of the piston and the slots of one pair being spaced substantially 90 from the slots of the other pair, and a pair 01" vanes extending diametrically through the respective pairs or slots for cooperation with the wall of the cylinder chamber, each vane having a one-piece body and one vane of the pair having an opening wholly within its edges and through which the other vane extends, said other vane having a section spaced inwardly from its side edges which is of shorter axial length than said side edges and of shorter axial length than the opening of said one vane, said piston having an opening substantially in alignment with one pair of slots and into which a portion of one of said vanes extends during assembling of said vanes into or removing the vanes from the piston, said other vane being capable of edgewise angular movement in one pair of the piston slots for movement to its assembled position in the piston and for movement 01' a portion of said other vane through said wholly inwardly lying opening.

2. In a rotary pump, a cylinder, a one-piece piston rotatable therein and having two sets of diametrically opposed radial slots terminating inwardly of its ends, and a'pair of one-piece vanes extending diametrically of the piston through said slots at substantially right angles to each other, said piston having an opening adjacent one end thereof substantially in alignment with the slots of one of. saidsets, one of said vanes having an opening lying wholly inwardly of its edges and the other having a portion of reduced lengthspaced'inwardly trom its side edges and adapted to extend through such last-mentioned opening and one of the vanes being shiftable axially of the piston by movement of a portion thereof in said opening of the piston to thereby position the vanes relative to each other for passage or said other vane through said last mentioned vane opening.

' 3, In a rotary pump, a cylinder, a one-piece piston rotatable therein and having two sets of diametrically opposed radial slots terminating inwardly of its ends, and a pair 01' one-piece vanes extending diametrically of the piston through said slots at substantially right angles to each other, one of said vanes having a shape resembling a quadrangular ring and the other having an H-like shape adapting said other vane for passage of a portion thereof substantially radially oi the piston through the opening of said one vane during assemblyor removal of the vanes from the piston, said piston having an opening therein substantially in alignment with the slots of one of said sets permitting axial shifting of one of the vanes to thereby facilitate passage of said portion of the H-like vane through the opening of the ring-like vane.

4. In a rotary pump, a housing having a cylinder therein, a one-piece piston having axial projections mounting the same for rotation in said cylinder and alsohaving two sets of diametrically opposed radial slots terminating inwardly of the ends of said projections, and a pair of one-piece vanes extending diametrically of the piston through said slots at substantially right-angles to each other, one of said vanes having an opening lying wholly inwardly of its edges and, the other having a portion of reduced length spaced inwardly from its side edges and adapted to extend through such last-mentioned opening, said piston having an opening therein substantially in alignment with one set of said slots, one of the vanes being shiftable inits slot axially oi the piston by movement of a portion of said vane into said opening of the piston to thereby position the vanes relative to each other for passage of the other van'e through said wholly inwardly lying opening bmedgewise angu- WALWIN L. DAVIS.

lar movement. 

